Stuff the loofa into the OJ container. Cut the soaps into small bits (I find grating the soap a faster way to melt it) I also uded the microwave to melt soap. After the soap is all melted, pour it into the container. Fill it about 1/3 at a time, giving the soap time to settle and firm up. Continue until the container is almost to the top (I usually leave about 1 inch or so) After the soap had hardened completely, peel away the paper container and what you have now is a "log" of loofa.
You can now slice this into any thickness you like. I usually do 3" pieces, that makes a nice bar of soap.